Abstract
The state is observed in the process with a statistical significance larger than 10 standard deviations using the data collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies between 3.7 and 4.6 GeV. This is the first observation of the in this process. The mass and width of the are determined to be and , respectively, and the production cross section () of is at the several hundred femtobarn level. No significant signal for the process is observed and the upper limit on is estimated to be 0.43 at the 90% confidence level. We also search for . No significant signal is observed, indicating a strong suppression relative to the corresponding decay, in violation of the “12% rule”.
- Received 14 September 2017
DOI:https://doi.org/10.1103/PhysRevD.99.012014
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society